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The man accused of trying to blackmail comedian David Letterman pleaded guilty to second-degree grand larceny at a hearing Tuesday afternoon.

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White House chief of staff Rahm Emanuel is accustomed to working in the shadows, but he now finds himself the subject of newspaper stories.

Progressive activists ratcheted up the pressure for health care reform Tuesday, picketing in front of a hotel where a group of insurance industry leaders were meeting.

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Johnny Cash can't have known about carbon nanotubes when he sang about rings of fire, but MIT scientists have shown how they can create electrical current—about 100 times as much energy per unit of weight as lithium-ion batteries.

The new experiments involved nanotubes, or submicroscopic structures just a few billionths of a meter in diameter, that can conduct both electricity and heat. Engineers coated the nanotubes with reactive fuel that produces heat by decomposing, and then ignited it with laser beams or high-voltage sparks.

That set off a fast-moving heat wave that traveled through the nanotube's hollow cylinder 10,000 times faster than in the reactive fuel itself, and reached a temperature of 4,940 degrees F (3,000 Kelvin). The fast-moving heat also pushed electrons along the tube and created a noticeable electrical current.

Such combustion waves were studied mathematically for a century, according to Michael Strano, a chemical engineer at MIT. Strano first predicted that a nanotube or nanowire could channel the heat pulse and create electrical current, but now his group has realized that prediction.

Some semiconductor materials can also produce an electric current when heated, but the carbon nanotube experiments defy predictions by thermoelectric calculations. Strano noted that the heat wave seemed to carry along electrons or other electrical charge carriers, not unlike how an ocean wave can pick up debris.

The possibility of creating substantial energy on such a tiny scale could lead to new ultra-small electronic devices the size of rice grains, whether for implantable medical chips or other tiny sensor applications.

Strano's MIT group plans to continue improving the efficiency and cut back on wasted energy given off as heat and light. Strano also suggested that a different reactive fuel coating for the nanotubes might produce alternating current — an intriguing contrast to current energy-storage systems that all produce direct current.

[MIT]

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A lesbian couple together for more than a decade smiled through tears Tuesday as they became the first same-sex couple to marry in the District of Columbia, on the first day such unions are legal in the nation's capital.

"He has his faults, but he is really a good person," says Irene Folstrom